Measure it against known par values and divid to get correct par. I believe it to be at 61 lux/par. Going against manufacturer numbers. Id measured against my light and hoppy's chart it seems pretty accurate as well

The ratio between PAR and Lux readings, for 6500-10000K fluorescent lights is more like 76 than 60. But, if you are measuring the light from a pink bulb, the sun, incandescent bulbs, etc. the ratio can be much different. Lux meters are very useful for rough measurements to see if a light fixture/bulb is going to work well for you, but they are not useful for actual research type measurements - determining how effective an actinic bulb is compared to a 6700K bulb, for example.

Lux meters are very useful for rough measurements to see if a light fixture/bulb is going to work well for you, but they are not useful for actual research type measurements - determining how effective an actinic bulb is compared to a 6700K bulb, for example.

Unbelievably well said! There's a lot of truth in that statement and I think it bears repeating. :-)

(Yes, I meant it....everyone read that again! )

Having a $20 LUX meter to go by is so eye opening (no pun) - so much better at showing you what the light really does as it radiates from your light source, as it overlaps with other light sources, etc, than "eyeballing it". If you're someone who DIY's or experiments with your lighting at all in any way, it would seem a shame not to have one of these to use. Even without being calibrated to anything (which just makes a LUX so much more informative).

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